1. Connection:Long press the multi-function key for three seconds, when there is a blue light flashing, that means the earphone is ready to be matched; Then open your smart phone and search signal X7. The blue light will be off when you connect sucessfully; If you want to connect to two devices at the same time, you just need to repeat the above operation;2. Music Playing: You can have the music paused and playing by pressing the only key on the earphone, when there is a phone call, the music will stop automatically;3. Hands-free phone calls: You can press the key to anwer or hang up a phone call;4. Re-dailing function: Double press the key, the earphone will call the latest number that called you before automatically;5. Language Switching(Engligh/Chiness):Slightly press the key for two seconds(not into Bluetooth patern), at this moment, the earphone will remind you by voice prompt. If the voice prompt is not in English, you can then press the key for two seconds, and it will switch into English for you;6. Voice Prompt: Under Power on/off, Bluetooth Connection these three patern, there will be always voice prompt for you;7. Battery Situation: On ios system, you can check the power on your smart device; Besides, the earphone will remind you when it tend to be low power. The blue flash light will be on during charging, and it will be off when the battery is full;